文章基本信息

标题：Tillage effects on physical qualities of a vertisol in the central highlands of Ethiopia
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作者：Teklu Erkossa
期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2011
卷号：5
期号：12
页码：1008-1016
DOI：10.5897/AJEST10.089
语种：English
出版社：Academic Journals
摘要：In the highlands of Ethiopia, tillage methods and frequency affect drainage, soil erosion, moisture conservation, weeding and harvesting of crops. This is through their effects on soil physical, chemical and biological qualities. In this study, four tillage methods for land preparation, “broad bed and furrows”,” green manure”, “reduced tillage “and the traditional tillage “ridge and furrows” were evaluated for their effects on soil physical quality indicators. The study was superimposed on the field experiment conducted on a vertisol area at Caffee doonsa for five years (1998 to 2002) in the central highland of Ethiopia. Penetration resistance (PR), aggregate stability, water-holding capacity, crust strength and thickness, texture, porosity, saturated hydraulic conductivity, bulk density and water holding capacity were the soil physical quality indicators considered. The result indicated that only PR was significantly (p<0.05) affected, where as the other parameter have shown a slight changes that are consistent with the effects on the bio-chemical parameters as previously reported. Broad bed furrows, and reduced tillage resulted in the highest and the lowest PR, respectively under both the moist and dry soil conditions. Green manure increased aggregate stability and reduced surface crust strength, which was linked to its increased organic matter content and consequent improved microbial activities.
关键词：Broad bed and furrow; green manure; reduced tillage; ridge and furrow; soil quality; land preparation